Assioncb



' inovahle ineniher lei Will remain stationary.

"Thus, my device is free from errors due to changes in its operating voltage.

In Fig, 2 of the drawing, a frequency meter 22, is operatively connected to an electrical circuit 23. 'lf'he meter 2'! comprises an clectro-responsive device ii that is operatively connected, through a reactor 25, to the circuit '23. and elecho-responsive device it} that is operativcly connected through a resistor 2? to the. circuit 23. a movable pointer 28 for the electro-responsive device 26 and a scale 29. Flexible members or cord 30 and 31 are adapted to he \lOllllthIflOlll one oi? their ends upon the shafts 3'2 and 33 of the clectro-respensive devices 2% and '26, respectively. The other end of the cord 30 is connected to a stationary member 30, and the other end of the cord 31 is connected to an intermediate point. 31 on the cord 30. Thus, the pointer as will indicate, in connection with the scale 2%), the ratio of the currents traversing the clectro-responsive devices 24: and 26. While I have illus trated a modified scheme of operatively connecting the electro-responsive devices, it Will he understood that they may also be connected substantially as shovvn in Fin. 1 of the drawing.

It the reactor 25 and the resistor so proportioned that, at a predetermined frequency, the same value of current traverses the clecho-responsive devices 24 and 26. the

piointer Qivbwill remain in its initial position.

.Ynvevor, if the frequency changes, more current will traverse one electro-responsive dcviia it n will traverse the other, and the point r lo will he pern'nttcd to move a. distame o indicate the frequency of the circuit in not wish to be limited to the specific ilica. cos of my invention illustrated nor to the means for connecting the electro-re spoiisive devices, as many modifications and adaptations mav he made therein without departing from the spirit and scope of the in? vention as set t'orth in the appended claims.

I claim as my invention:

1.1a an electric circuit, the con'ibination out will traverse the electro-respon-.

sive to the temperature oi the translating device, a resistor-having substantially zero tempe'ature coeliic'icnt, a sccond responsive means connected in sea-ins with the resistor to the circuit, and means actuated in accordance with the dili'ercntial forces of the responsive means In an electric circuit. the comhinatiou with a translating device, ol means opera-- tivelv connected to the circuit that is rcsponsive to changes'in the temperature oi the translating cevici resistor having suhstantially zero tc npcrami co-ellicicut, a second responsive in ans operatively connected in series with the lOSlSQOl' to the circuit, and a protective device adapted to he actuated in accordance with the ratio of the forces of the said responsive means.

In an electric circuit, the combination with a translatiir; device, of means rcspoir sive to the temperature of the translating device, a resistor having a neglihlc tempera ture co-ellicieut, a second responsive means connected in series with the resistor to the circuit, and means adapted to be actuated in accordance with the ratio of the forces of the a'jloresaid responsi means.

at. In an electric circuit, the combination with zcti'aiislatingr device, a resistor adapted to be heated in accordance with the temperature of the translating device, and a second resistor having); substantially Zero temperature co-etlieient, of an elcctro-ri, sponsivc device connected in circuit with the first rcsistor, a second electro-responsive device connected in circuit with the second resistor. and means adapted to be actuated in accordance with the ratio of the torques of the electro-rcsponsive devices.

, responsive device connected to the exploring resistor and to the electric circuit. a second electro-responsive device connected to the second resistor and to the electric circuit, and a movable member, said electro1'esponsive devices being so connected together that the movable member is adapted to move in accordance with the ratio of the torques of the electro-responsive devices.

In testimony whereof, I have hereunto subscribed my name this 31st day of March 1916.

LESLIE N. CRIC HTON. 

